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    <title>ShellCheck: SC2208 – Use `[[ ]]` or quote arguments to `-v` to avoid glob expansion.</title>
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    <h1>SC2208 – ShellCheck Wiki</h1>
    <a href="https://github.com/koalaman/shellcheck/wiki/SC2208">See this page on GitHub</a>
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    <h2 id="use---or-quote-arguments-to--v-to-avoid-glob-expansion">Use
<code>[[ ]]</code> or quote arguments to <code>-v</code> to avoid glob
expansion.</h2>
<h3 id="problematic-code">Problematic code:</h3>
<div class="sourceCode" id="cb1"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb1-1"><a href="SC2208.html#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="bu">[</span> <span class="ot">-v</span> foo[0] <span class="bu">]</span> </span></code></pre></div>
<h3 id="correct-code">Correct code:</h3>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="SC2208.html#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="bu">[</span> <span class="ot">-v</span> <span class="st">&#39;foo[0]&#39;</span> <span class="bu">]</span></span></code></pre></div>
<h3 id="rationale">Rationale:</h3>
<p>With <code>[</code>, arguments will undergo glob expansion. If a file
<code>foo0</code> exists when the problematic code is run, it will check
for the variable <code>foo0</code> instead of the array entry
<code>foo[0]</code>. If there additionally exists a <code>foo1</code>,
it will simply fail with an error.</p>
<p>Use <code>[[ ]]</code> or quote the argument.</p>
<h3 id="exceptions">Exceptions:</h3>
<p>None.</p>
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    <p style='font-size: 80%'><a href="../index.html">ShellCheck</a> is a static analysis tool for shell scripts. This page is part of its documentation.</p>
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